Elevator-alarm



2 Sheets-Sheet 1.

(No Model.)

A, 0. JJACOBI.

ELEVATOR ALARM.

Patented Nov. 28, 1882.

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I (No Model.) 2 SAeets-Sheet 2. 4 A. 0. JAOOBI. I ELEVATOR ALARM.

' No. 268,105. Patented Nov. 28, 1882.

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UNITED STATES PATENT OFFICE.

AUGUST 0. JAGOBI, OF SAND CREEK, XVISCONSIN.

ELEVATOR-ALARM.

SPECIFICATION forming part of Letters Patent No. 268,105, dated November28, 1882,

Application filed October 21, 1882. (No model.)

To all whom. it may concern Be it known that I, AUGUST 0. JACOBI, ofSand Creek, Dunn county,Wisconsin,h'ave invented a new and usefulImprovementin Elevator-Alarms, of which the following is afull, clear,and exact description, reference being had to the accompanying drawings,makinga part of this specification, in which- Figure 1 is a perspectiveview of an elevatorbox with my improvements attached. Fig. 2 is anelevator with one side of the casing removed. Fig.3 is a transversevertical section through 00 w of Fig. 1. Fig. 4 is a perspective view ofthe driving-wheel with the rocker-arm attached. Fig. 5 is a detachedview of the rocker-arm. Fig. 6 is a section of the drivingwheel, showingthe slot through which the rocker-arm works. Fig. 7 is a detached viewof the crank-lever for operating the alarm. Fig. Sis a detached view ofthe alarm mechan- My invention has reference to elevators used in millsfor raising grain and other mill-stuff; and it consists in devices forgiving an alarm whenever the elevator stops from clogging or othercause. Elevators are liable to stop from clogging and other causes.Sometimes they are overloaded with grain or other mill-stuff. Sometimesthe buckets get loose on one side and catch on the elevator-legs. It isalso well known that gas in greater or less quantities is always presentin elevators, and when the ele vator stops without being noticed thedriving pulley or wheel continues to revolve, and by friction with thebelt will heat, cause fire and explosion. To prevent such disasters isthe object of my present invention.

To enable others skilled in the artto make and use my invention, I willproceed to deof the driving-wheel, as shown in Fig. 2. The inner end ofthe rocker-arm is bent at right angles to form a crank, for a purposehereinafter explained.

The coil-spring F is attached at one end to the rim of thedriving-wheel, and its opposite end to the rocker-arm, as shown in Fig.2, so that when the bent end of the rocker-arm is carried toward theshaft of the driving-wheel the coilspring is extended, and when the bentend is released it is drawn again in its normal position by thecontraction of the spring. This rocker-arm, extending through the slotand a small distance beyond the surface of the driving-wheel, isnecessarily brought in contact with the elevator-belt B.

It is evident from this description that while the belt is moving withthe driving-wheel no effect is produced upon the rocker-arm E; butwhenthe elevator-belt ceases to move, from any cause whatever, frictionis brought 'to bear upon the rocker-arm, which causes it to move uponits pivot and throw back the bent portion or crank 0. Thus by meansot'friction with the belt B and the coil-spring F the crankcis caused tovibrate. When the friction is on, the crank moves toward the center ofthe driving-wheel, and when the friction is relieved the coil-springdraws it toward the periphery. I will now suppose the elevator-belt tobe arrested in its course from clogging or other cause. Frictionisimmediately bronghtto bear upon the rocker-arm E, which throws thecrank e toward the shaft of the driving-wheel, bringing the crank incontact with the short arm of the bent lever G, which is moved aroundoneqnarter of a circle, at the same time raising the outer arm, g,through one-quarter of a circle. The lever is then released and allowedto resume its normal position until the next revolution of the wheel,when this operation is repeated, and will be continued as long as theband is stationary and producing friction on the rocker-arm 'E.

To the outer arm of the bent lever G is attached a rod or cord, H, theopposite end of said cord being attached to the coil-spring I, as shownin Fig. 1. To this coil-spring is at tached the alarm-bell J.

The operation of my device is as follows:

Whenever, from any cause, the elevator ceases to operate, the frictionof the belt upon the rocker-arm E causes the bent portion 6 of that armto come in contact with the bentlever G, and that in turn causes theouter end of that to rise and ring the bell as long as the drivingwheelrevolves and the elevator-belt fails to operate; but as soon as theelevator resumes its operation the rocker-arm would be relieved fromfriction, bent lever G would remain undisturbed, and the aiarm-eignalswould cease to be given.

In order that the bent lever G may be at all times in the properposition to be caught and moved by the crank c it has its hearingin theadjustable plate K, as shown in Fig. l, and by means of thisadjusting-plate the bearing and position of the bent lever B is readilyadjusted.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. in an elevator-alarm, the driving-pulley 0, provided with a slot, (Z,in its rim, in combination with the pivoted. rocker-arm E, provided witha rim passing through the slot 61, and having its inner end, 6, bentinto a crank at right angles to the plane of its motion, substantiallyas herein described. I

2. In an elevator-alarm, the driving-pulley 0, provided with the slotdin its rim, and carrying the pivoted rocker-arm E, provided with thecrank e, in combination with the bent lever G, having its bearing in theadjustable plate K, substantially as and for the purpose set forth.

3. The driving-pulley O, carrying the rockerarm E, in combination withthe bent lever G, cord E, and alarm mechanism, substantially as and forthe purpose set forth.

AUGUST 0. JACOBI.

Witnesses WILLIAM WOHLRAB, RUDOLPH RUNG.

